CN104734514A - Primary side current regulation on llc converters for led driving - Google Patents
Primary side current regulation on llc converters for led driving Download PDFInfo
- Publication number
- CN104734514A CN104734514A CN201410769355.7A CN201410769355A CN104734514A CN 104734514 A CN104734514 A CN 104734514A CN 201410769355 A CN201410769355 A CN 201410769355A CN 104734514 A CN104734514 A CN 104734514A
- Authority
- CN
- China
- Prior art keywords
- transformer
- primary side
- resistor
- coupled
- side winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the primary side current regulation on LLC converters for LED driving. The LLC converter (200) comprises a bridge circuit (210), coupled to an input voltage (220), comprising at least one pair of power switches (230, 240), a resonant network, coupled to the bridge circuit and being driven by the at least one pair of power switches, an output transformer (270), coupled to the resonant network; the transformer having a first and a second primary side (271, 272) winding and at least a secondary side winding (273), a current sense transformer (300), coupled on the primary side in series to the resonant network and the first primary winding of the transformer, an integrator circuit coupled in parallel to the second primary side winding of the transformer and in parallel to the secondary side winding of the current sense transformer providing an integration of the voltage of the second primary side winding of the output transformer, a rectification circuit(290), coupled to the second primary side winding of the transformer, the transformer providing an output current of the LLC series resonant converter and a frequency adjustment controller (310), coupled to at least one pair of power switches and the current sense transformer and the integrator circuit providing driving signals to the at least one pair power switches.
Description
Technical field
The present invention relates to the Successful Operation improving inductor capacitor transducer (" LLC converter "), and more particularly, relate to the reliability increasing LLC converter and the production cost reducing LLC converter.More particularly, example of the present invention relates to by using current sense transformer to control the output of LLC converter in the primary side of the transformer of LLC converter.
Background technology
The power converter of the type day by day received publicity is inductor capacitor transducer (" LLC converter ").In standard LLC converter, primary side current is the summation of reflected secondary side electric current (divided by turn ratio) and magnetizing current.
Fig. 1 is the prior art circuits configuration of the common LLC converter 1 with half-bridge structure.LLC converter 1 represents the circuit be made up of two inductors and a capacitor.Half-bridge circuit 3 is by for driving a pair mains switch 5 and 7 of resonant network 9 to be formed.LLC has three resonant parameters.First resonant parameter is series-resonant inductor Lr, and the second parameter is series resonance capacitor Cr and the 3rd resonant parameter is the magnetising inductance Lm of transformer 11.
The input terminal 13 of LLC converter is DC voltage.Transformer 11 makes half-bridge circuit 3 and resonant network 9 isolate with rectification circuit 15 by a primary side winding 17 and two series connection primary side windings 19,21.Two series connection primary side winding 19,21 series coupled.
Rectification circuit 15 comprises a pair rectifier diode 23 and 25.Diode 23 and 25 is connected to output capacitor 27.The negative electrode of diode 23,25 is connected to the positive terminal of capacitor 27.The anode of diode 23 is connected to the positive terminal of secondary side coil 19, and the anode of diode 25 is connected to the negative terminal of secondary side coil 21.Common connected node between coil 19,21 is the ground connection of output voltage.
The mains switch 5,7 (generally under the condition of 50%) under the condition of same pulse width of LLC converter 1 deducts operation time of delay.The adjustment to output voltage is obtained by the frequency of operation changing mains switch 5,7.
For providing suitable drive singal with stabilizing output current to LLC converter, current sense transformer can be used according to prior art level.Described current sense transformer is anti-parallel connected to secondary side coil.One in the shortcoming of this current sense transformer is: this type of current sense transformer is expensive, this is because they must stand the high-isolating of (such as) 4kV.In addition, extra overvoltage protection is needed on the output side, this is because LLC converter is only subject to Current Control under the help of current sense transformer.This overvoltage protection can (such as) be provided by optical coupler and Zener diode or short-circuiting device system.In conjunction with current sense transformer, optical coupler and Zener diode is used to make total system very expensive.
Therefore, better technology is needed to solve above problem to provide suitable drive singal to LLC converter.Therefore, general objectives of the present invention is for being provided for the replacement scheme providing suitable drive singal to LLC converter, and described replacement scheme allows the more cheap sensing to secondary side current and secondary-side voltage.
Summary of the invention
One aspect of the invention is LLC converter.According to an example of the present invention, LLC converter can have bridgt circuit (it is coupled to input voltage) and at least one pair of mains switch.Resonant network can be coupled to described bridgt circuit and can be driven by least one pair of mains switch described.In addition, LLC converter can have the transformer being coupled to described resonant network, and wherein said transformer can comprise the first and second primary side windings and at least one primary side winding.In addition, LLC converter can comprise current sense transformer (it is coupled in series to the first armature winding of resonant network and transformer on the primary side as well) and integrator circuit (it can be coupled in parallel to the second primary side winding of transformer and can be coupled in parallel to the primary side winding of current sense transformer, thus provides the integration of the voltage of the second primary side winding (or auxiliary winding) 272 that Fig. 3 of transformer shows).Rectification circuit can be coupled to the primary side winding of described transformer.Described transformer can provide the output current of LLC series resonant converter.Frequency adjustment controller can be coupling at least one pair of mains switch described and between described current sense transformer and described integrator circuit, thus provides drive singal at least one pair of mains switch described.
Exemplarily should understand the positive terminal of term transformer and current sense transformer and negative terminal and primary side and primary side respectively to be easy to the understanding of the present invention.Certainly, positive terminal can be negative terminal and primary side can be the primary side of transformer, and vice versa.
Of the present invention unexpected find in one be, according to prior art level, the current sense transformer in the primary side of transformer and the current sense transformer in non-usage primary side can be used to control the output of LLC converter.
This one directly measured on the primary side as well in the shortcoming of the electric current of LLC converter is, the magnetizing current of the magnetising inductance of necessary compensator transformer is with the secondary side current of calculating transformer.Whereby, be applied to transformer owing to by square wave, the magnetizing current of transformer self can have triangular waveform.
According to the present invention, by synthesizing magnetizing current to compensate described magnetizing current under the help of integrator.Integrator self can serve as low pass filter whereby.Because integrator can be coupled in parallel to the auxiliary winding of transformer, so the mode that the peak value of synthesis triangular waveform and slope can be identical with magnetizing current self depends on transformer voltage and switching frequency.By integrator being coupled to the primary side of current sense transformer, synthesis magnetizing current can be deducted, and can eliminate or reduce the dependence of primary current to magnetizing current of transformer whereby.For deducting synthesis magnetizing current from the electric current in the primary side of current sense transformer, can be advantageously, the negative terminal of the positive terminal of the secondary winding of the primary side of coupling transformer and the secondary winding of current sense transformer and the positive terminal of the negative terminal of secondary winding of the primary side of coupling transformer and the secondary winding of current sense transformer.
According to an aspect of the present invention, integrator circuit can comprise at least four resistors and the first capacitor.First resistor and the 3rd resistor can be connected in series, and wherein said first resistor can be connected to the positive terminal of the second primary side winding of transformer.Second resistor and the 4th resistor can be connected in series, and wherein said second resistor can be connected to the negative terminal of the auxiliary winding of transformer.With the second winding parallel of transformer, the first side of the first capacitor can be connected between the first resistor and the 3rd resistor and the second side of the first capacitor and can be connected between the second resistor and the 4th resistor.3rd resistor can be connected to the negative terminal of the primary side winding of current sense transformer and the 4th resistor can be connected to the positive terminal of the primary side winding of current sense transformer.
In accordance with a further aspect of the present invention, first or second source switch be mos field effect transistor (MOSFET).
According to an aspect of the present invention, rectification circuit can comprise at least two rectifier diodes.According to an aspect of the present invention, described at least two rectifier diodes can be connected to the anode of output capacitor and the negative electrode of described output capacitor can be connected to ground connection.
According to an aspect of the present invention, the anode of the first rectifier diode can be connected to the positive terminal of the primary side winding of transformer, and the anode of the second rectifier diode can be connected to the negative terminal of the primary side winding of transformer.
In replacement scheme, the form that can be connected to the full-wave rectifier of the single primary side winding of transformer provides rectification circuit.Therefore, the anode of the first and second rectifier diodes can be connected to ground connection, and the negative electrode of the first rectifier diode can be connected to the positive terminal of the secondary winding of transformer, and the negative electrode of the second rectifier diode can be connected to the negative terminal of the secondary winding of transformer, and the anode of the 3rd rectifier diode can be connected to the positive terminal of the secondary winding of transformer, and the anode of the 4th rectifier diode can be connected to the negative terminal of the secondary winding of transformer, and the negative electrode of the third and fourth the second rectifier diodes can be connected to the anode of output capacitor, and the negative electrode of output capacitor is connected to ground connection or resistor.
According to a further aspect in the invention, at least one inductor can be coupling between bridgt circuit and transformer.According to an example again, the anode of the first bias diode is connected to the positive terminal of the second armature winding of transformer, and the anode of the second bias diode is connected to the negative terminal of the second armature winding of transformer, and the negative electrode of the first and second bias diodes is connected to common connecting point.In addition, according to an example, described common connecting point is connected to the input of frequency adjustment controller.
According in this respect, series-resonant inductor can not be integrated in transformer.Therefore, the second armature winding of transformer copies the output voltage of the secondary winding by turn ratio adjustment.Therefore, the voltage at common connecting point place can be proportional with output voltage.There is controller known in prior art level (such as; TPS92020 from Texas Instrument (Texas Instruments)); described controller has internal overvoltage protection, the signal of described overvoltage protection switch when the bias voltage at common connecting point place is too high.Certainly, obvious for those skilled in the art, the overvoltage protection of other type can be used based on the bias voltage at common connecting point place.
According to the present invention, under the external inductance that can be coupled in series between resonant network and transformer and the help of voltage that may be provided in the first common connecting point place, provide overvoltage protection without any need for Zener diode and optical coupler.
According to an aspect of the present invention, the anode of the first current sense diode can be connected to the positive terminal of the primary side winding of current sense transformer, and the anode of the second current sense diode can be connected to the negative terminal of the primary side winding of current sense transformer.The negative electrode of the first and second current sense diode can be connected to the second common connecting point.Second common connecting point can be connected to the second input of frequency adjustment controller.
According to an aspect of the present invention, low pass filter can be connected to the second common connecting point and frequency adjusts between the second input of controller.Described low pass filter can comprise be coupling in the 5th resistor between the second tie point and ground connection, be connected to the second input that the second common connecting point and frequency adjust controller between the 6th resistor and the second capacitor.Between the second input that first side of the second capacitor can be coupling in frequency adjustment controller and the 6th resistance, and the second side of the second capacitor can be connected to ground connection.
Under the help of low pass filter, the electric current measured by current sense transformer can through extraction with the current in proportion in the primary side of transformer.
In accordance with a further aspect of the present invention, comparator can be connected to the 6th resistor and be connected to the 3rd input of frequency adjustment controller, and wherein said comparator can be configured to compare and the voltage of the current in proportion in the primary side of controller and reference voltage.
Described comparator can be error amplifier and compares and the voltage of the current in proportion in the primary side of controller and reference voltage.Frequency adjustment controller can use errors signal to carry out the switching frequency of modulation power source switch.
Accompanying drawing explanation
By reference to the following detailed description of carrying out when by reference to the accompanying drawings will more easily understand of the present invention above in and many with advantage, this is because above aspect of the present invention and many adjoint advantages are better understood, wherein:
Fig. 1 illustrates the schematic diagram according to an example of the inductor capacitor transducer of prior art level;
Fig. 2 is the grid voltage that mains switch is described and the chart copying secondary side current recorded on the primary side as well;
Fig. 3 illustrates the schematic diagram according to an example of inductor capacitor transducer of the present invention;
Fig. 4 illustrates the chart through compensating output current according to inductor capacitor transducer of the present invention;
Fig. 5 illustrates the chart according to the not compensated output current of inductor capacitor transducer of the present invention;
Fig. 6 illustrates according to the not compensated output current of inductor capacitor transducer of the present invention and the chart compared through compensating output current; And
Fig. 7 is the chart of the circuit with Fig. 3 that full-wave rectifier exports.
Embodiment
Although hereafter illustrate and describe illustrative example, will understand, can without departing from the spirit and scope of the present invention wherein in make various change.In that respect, the detailed description hereafter stated by reference to the accompanying drawings is only intended to the description as the various examples of disclosed subject matter and is not intended to represent only example.Each example described in the present invention only as an example or illustrate and provide.The illustrative example provided herein is not intended to for detailed or limit the invention to disclosed precise forms.Similarly, any step described herein can with the combining and interchanging of other step or step, to reach identical or similar in fact result.
The grid voltage 110,120 that Fig. 2 shows mains switch and the chart 100 copying secondary side current recorded in the primary side of LLC converter.Two mains switches (generally under the condition of 50%) under the condition of same pulse width deduct operation time of delay.Voltage 130 represents the central point of two mains switches.The electric current 140 measured by current sense transformer comprises reflected secondary side electric current and the magnetizing current 150 of transformer.Electric current 160 represent deducted magnetizing current 150 from it record electric current 140, and therefore proportional with the secondary side current of the transformer of LLC converter and can be used for the output regulating LLC converter.
Equipment by showing in Fig. 3 puts into practice example of the present invention.Fig. 3 shows the schematic diagram of an example according to inductor capacitor transducer of the present invention.LLC converter 200 comprises the bridgt circuit 210 being coupled to input voltage 220.Bridgt circuit 210 comprises at least one pair of mains switch 230,240.Resonant network 250 is coupled to bridgt circuit 210 and is driven by least one pair of mains switch 230,240.Inductor 260 as resonant network 250 part and be coupling between bridgt circuit 210 and transformer 270.
Transformer 270 is coupled to resonant network 250, and wherein said transformer comprises the first primary side winding 271 and auxiliary winding 272 and at least one primary side winding 273.Current sense transformer 300 in the primary side 321 of current sense transformer 300 with the first armature winding 271 series coupled of resonant network 250 and transformer 270.
Integrator circuit 280 is coupled in parallel to the auxiliary winding 272 of transformer 270 and is coupled in parallel to the primary side winding 302 of current sense transformer, thus provides the integration of the voltage of the second primary side winding of described transformer.Integrator circuit 280 comprises at least four resistors 281,282,283,284 and first capacitor 285, and wherein the first resistor 281 and the 3rd resistor 283 are connected in series.Described first resistor is connected to the positive terminal 272 ' of the auxiliary winding 272 of transformer 270.Second resistor 282 and the 4th resistor 284 are connected in series; Second resistor 282 is connected to the negative terminal 272 of the auxiliary winding 272 of transformer 270 ".In parallel with the auxiliary winding 272 of transformer 270, the first side of the first capacitor 285 is connected between the first resistor 281 and the 3rd resistor 283 and the second side of the first capacitor 285 and is connected between the second resistor 282 and the 4th resistor 284.3rd resistor 283 is connected to the negative terminal 301 of the primary side winding of current sense transformer 300, and the 4th resistor 284 is connected to the positive terminal 302 of the primary side winding of current sense transformer 300.
Rectification circuit 290 is coupled to the primary side winding 273 of the transformer 270 of the output current providing LLC series resonant converter.Frequency adjustment controller 310 is coupling between at least one pair of mains switch 230,240 and current sense transformer 300 sum-product intergrator circuit 280, thus provides drive singal at least one pair of mains switch described.
The anode of the first bias diode 320 is connected to the positive terminal 272 ' of the second armature winding 272 of transformer 270, and the anode of the second bias diode 330 is connected to the negative terminal 272 of the second armature winding 272 of transformer 270 ".The negative electrode of the first and second bias diodes 320,330 is connected to the first common connecting point and described first common connecting point is connected to the first input end that frequency adjusts controller 310.
The anode of the first current sense diode 340 is connected to the positive terminal of the primary side winding 302 of current sense transformer 300, and the anode of the second current sense diode 350 is connected to the negative terminal of the primary side winding 302 of current sense transformer 300.
The negative electrode of the first and second current sense diode 340,350 is connected to the second common connecting point.Low pass filter 360 is connected to described second common connecting point and frequency adjusts between the second input of controller 310.Low pass filter 360 comprises and is coupling in the 5th resistor 370 between the second common connecting point and ground connection, is coupling in the 6th resistor 380 between the second common connecting point and the second capacitor 390.First side of the second capacitor 390 is coupled to the 6th resistance 380 and the second side of the second capacitor 390 is connected to ground connection.Comparator 400 is connected to the 6th resistor and is connected to the 3rd input of frequency adjustment controller 310, and wherein comparator 400 is configured to compare the voltage and the reference voltage that adjust the current in proportion in the primary side of controller 310 with frequency.
Fig. 4 to 6 show according to inductor capacitor transducer of the present invention through compensate and not compensated output current.For test is according to LLC converter of the present invention, between 390V and 410V, change input voltage.Lead-out terminal according to LLC converter of the present invention is connected to electronic load, and wherein said electronic load is that constant-voltage load is to simulate LED strip.Output voltage is arranged between 18V and 24V and changes.As shown in Fig. 4, in all conditions through compensate output current variation maximum up to+2.75% and-0.75%.If centered by 4.04A, so change will up to +/-1.73%.Fig. 5 is illustrated in and the not compensated LLC converter through compensating under the identical condition of LLC converter according to the present invention.Not compensated current variation is maximum up to+17.5% and-2.5%.If centered by mean value, so curent change will up to +/-9.3%.Fig. 6 show not compensated LLC converter according to the present invention with through compensating directly comparing of LLC converter.
The amendment (being roughly 700) of the circuit of Fig. 7 exploded view 3, wherein the secondary winding of transformer 270 is not centre-tapped, and alternatively utilizes full-wave rectification 702.
Although describe the present invention in detail, should be understood that and can make various change, replacement and change to the present invention not departing from the spirit and scope of the present invention situation as defined by the appended claims.
Claims (17)
1. a LLC converter, it comprises:
Bridgt circuit, it is coupled to input voltage, comprises at least one pair of mains switch;
Resonant network, it is coupled to described bridgt circuit and is driven by least one pair of mains switch described;
Output transformer, it is coupled to described resonant network; Described transformer comprises the first primary side winding, auxiliary winding and at least one primary side winding;
Current sense transformer, it is coupled in series to described first armature winding of described resonant network and described transformer on the primary side as well;
Integrator circuit, it is coupled in parallel to the second primary side winding of described output transformer and is coupled in parallel to the primary side winding of described current sense transformer, thus provides the integration of the voltage of the described second primary side winding of described output transformer;
Rectification circuit, it is coupled to the described primary side winding of described transformer, and described transformer provides the output current of described LLC series resonant converter;
Frequency adjustment controller, it is coupling at least one pair of mains switch described and between described current sense transformer and described integrator circuit, thus provides drive singal at least one pair of mains switch described.
2. LLC converter according to claim 1, it comprises further:
Described integrator circuit comprises at least four resistors and the first capacitor, wherein the first resistor and the 3rd resistor string connection connector, and described first resistor is connected to the positive terminal of the described second primary side winding of described transformer;
Second resistor is connected with the 4th resistor in series, and described second resistor is connected to the negative terminal of the described second primary side winding of described transformer;
With the described second primary side winding parallel of described transformer, first side of described first capacitor is connected between described first resistor and described 3rd resistor and the second side of described first capacitor and is connected between described second resistor and described 4th resistor, and wherein
Described 3rd resistor is connected to the negative terminal of the described primary side winding of described current sense transformer and described 4th resistor is connected to the positive terminal of the described primary side winding of described current sense transformer.
3. LLC converter according to claim 1, wherein
First or second source switch be mos field effect transistor MOSFET.
4. LLC converter according to claim 1, wherein
Described rectification circuit comprises at least two rectifier diodes.
5. LLC converter according to claim 4, wherein
The negative electrode of at least two rectifier diodes is connected to a terminal of output capacitor and the another terminal of described output capacitor is connected to ground connection;
The anode of the first and second rectifier diodes is connected to ground connection and the negative electrode of described first rectifier diode is connected to the described positive terminal of the described secondary winding of described transformer and the negative electrode of described second rectifier diode is connected to the described negative terminal of the described secondary winding of described transformer, and the anode of the 3rd rectifier diode is connected to the described positive terminal of the described secondary winding of described transformer and the anode of the 4th rectifier diode is connected to the described negative terminal of the described secondary winding of described transformer, and the negative electrode of described third and fourth rectifier diode is connected to a terminal of output capacitor and the another terminal of described output capacitor is coupled to ground connection.
6. LLC converter according to claim 4, wherein
The described anode of described first rectifier diode is connected to the described positive terminal of the described primary side winding of described output transformer, and the described anode of the second rectifier diode is connected to the described negative terminal of the described primary side winding of described output transformer.
7. LLC converter according to claim 1, wherein
At least one inductor is coupling between described bridgt circuit and described output transformer.
8. LLC converter according to claim 7, wherein
The anode of the first bias diode is connected to the described positive terminal of described second armature winding of described output transformer and the anode of the second bias diode is connected to the described negative terminal of described second armature winding of described output transformer and the negative electrode of described first and second bias diodes is connected to the first common connecting point.
9. LLC converter according to claim 8, wherein
Described first common connecting point is connected to the first input end of described frequency adjustment controller.
10. LLC converter according to claim 1, wherein
Described frequency adjustment controller is analog controller.
11. LLC converter according to claim 1, wherein
The anode of the first current sensor diode is connected to the described positive terminal of the described primary side winding of described current sense transformer, and the anode of the second current sense diode is connected to the described negative terminal of the described primary side winding of described current sense transformer.
12. LLC converter according to claim 11, wherein
The negative electrode of described first and second current sense diode is connected to the second common connecting point.
13. LLC converter according to claim 12, wherein
Resistor is connected to described second common connecting point and described frequency adjusts between the second input of controller.
14. LLC converter according to claim 13, wherein
Low pass filter is connected to described second common connecting point and described frequency adjusts between described second input of controller.
15. LLC converter according to claim 14, wherein
Described low pass filter comprise be coupling in the 5th resistor between described second tie point and ground connection, be coupling in described second input that described second common connecting point and described frequency adjust controller between the 6th resistor and the second capacitor, the first side of described second capacitor is coupling between described second input of described frequency adjustment controller and the 6th resistor and the second side of described second capacitor is connected to ground connection.
16. LLC converter according to claim 15, wherein
Comparator is coupled to described 6th resistor and is coupled to the 3rd input of described frequency adjustment controller, and wherein said comparator is configured to compare the voltage and the reference voltage that adjust the current in proportion in the primary side of controller with described frequency.
17. 1 kinds of LLC converter, it comprises:
Bridgt circuit, it is coupled to input voltage, comprises at least one pair of mains switch;
Resonant network, it is coupled to described bridgt circuit and is driven by least one pair of mains switch described;
Output transformer, it is coupled to described resonant network; Described transformer comprises the first and second primary side windings and at least one primary side winding;
Current sense transformer, it is coupled in series to described first armature winding of described resonant network and described output transformer on the primary side as well;
Integrator circuit, it is coupled in parallel to the described second primary side winding of described output transformer and is coupled in parallel to the primary side winding of described current sense transformer, thus provides the integration of the voltage of the described second primary side winding of described transformer;
Rectification circuit, it is coupled to the described primary side winding of described output transformer, and described output transformer provides the output current of described LLC series resonant converter,
Frequency adjustment controller, it is coupled at least one pair of mains switch and described current sense transformer and described integrator circuit, thus provides drive singal at least one pair of mains switch described, and
At least one inductor, it is coupling between described bridgt circuit and described transformer, and the anode of the first bias diode is connected to the positive terminal of described second armature winding of described transformer and the anode of the second bias diode is connected to the negative terminal of described second armature winding of described transformer, and the negative electrode of described first and second bias diodes is connected to the first common connecting point, and wherein said first common connecting point is connected to the first input end of described frequency adjustment controller; And wherein
The anode of the first current sense diode is connected to the positive terminal of the described primary side winding of described current sense transformer, and the anode of the second current sense diode is connected to the negative terminal of the described primary side winding of described current sense transformer;
Described integrator circuit comprises at least four resistors and the first capacitor, and wherein the first resistor is connected with the 3rd resistor in series, and described first resistor is connected to the positive terminal of the described second primary side winding of described transformer;
Second resistor is connected with the 4th resistor in series, and described second resistor is connected to the negative terminal of the described second primary side winding of described transformer;
With the described second primary side winding parallel of described transformer, first side of described first capacitor is connected between described first resistor and described 3rd resistor and the second side of described first capacitor and is connected between described second resistor and described 4th resistor, and wherein
Described 3rd resistor be connected to the negative terminal of the described primary side winding of described current sense transformer and described 4th device be connected to the described primary side winding of described current sense transformer positive terminal and wherein
The negative electrode of described first and second current sense diode is connected to the second common connecting point and described second common connecting point is coupled to the second input that described frequency adjusts controller; And wherein
Low pass filter is connected to described second common connecting point and described frequency adjusts between described second input of controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/133,044 US9203318B2 (en) | 2013-12-18 | 2013-12-18 | Primary side current regulation on LLC converters for LED driving |
| US14/133,044 | 2013-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104734514A true CN104734514A (en) | 2015-06-24 |
| CN104734514B CN104734514B (en) | 2019-08-23 |
Family
ID=53369685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410769355.7A Active CN104734514B (en) | 2013-12-18 | 2014-12-12 | Primary side current in the LLC converter of LED driving is adjusted |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US9203318B2 (en) |
| CN (1) | CN104734514B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107659160A (en) * | 2017-11-10 | 2018-02-02 | 深圳市垅运照明电器有限公司 | A kind of DC DC constant-current circuits |
| CN107735946A (en) * | 2015-06-30 | 2018-02-23 | 通快许廷格两合公司 | High-frequency amplifier equipment |
| CN109560706A (en) * | 2017-09-27 | 2019-04-02 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN110112928A (en) * | 2019-05-23 | 2019-08-09 | 北京闿明创新科技有限公司 | A kind of electric energy transfer device |
| CN111585443A (en) * | 2019-02-19 | 2020-08-25 | 布鲁萨电子公司 | DC-DC converter |
| CN114128121A (en) * | 2021-04-12 | 2022-03-01 | 英诺赛科(苏州)科技有限公司 | Power converter with lossless current sensing capability and implementation thereof |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099230B (en) | 2014-04-16 | 2018-07-31 | 华为技术有限公司 | Controlled resonant converter and its synchronous rectification translation circuit |
| JP6669387B2 (en) * | 2015-12-16 | 2020-03-18 | キヤノン株式会社 | Power supply device and image forming apparatus |
| ITUA20163028A1 (en) * | 2016-04-29 | 2017-10-29 | Ledcom Int S R L | Circuit of a switching converter |
| US10374516B2 (en) | 2016-08-19 | 2019-08-06 | Semiconductor Components Industries, Llc | Non zero-voltage switching (ZVS) detection in resonant converters |
| EP3528378B1 (en) * | 2018-02-19 | 2021-06-09 | OSRAM GmbH | Electronic converter and related lighting system |
| DE102018129567A1 (en) * | 2018-11-23 | 2020-05-28 | Infineon Technologies Austria Ag | Power converter |
| EP3713376B1 (en) * | 2019-03-19 | 2024-02-28 | Tridonic GmbH & Co KG | Improved led short circuit and open load detection with a single controller pin |
| US10826402B1 (en) * | 2019-09-05 | 2020-11-03 | Semiconductor Components Industries, Llc | Methods and systems of controlling switching frequency of LLC resonant power converters |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130592A (en) * | 2009-12-28 | 2011-07-20 | 意法半导体股份有限公司 | Integrated circuit for an oscillator adapted to drive a control device of a switching resonant converter |
| CN102163919A (en) * | 2009-12-28 | 2011-08-24 | 意法半导体股份有限公司 | Charge-mode control device for a resonant converter |
| US8027174B2 (en) * | 2008-07-25 | 2011-09-27 | Samsung Electro-Mechanics Co., Ltd. | Adapter power supply |
| CN102684464A (en) * | 2011-03-15 | 2012-09-19 | 雅达电子国际有限公司 | Resonant converter device and use method therefor |
| CN103138590A (en) * | 2011-12-02 | 2013-06-05 | 中兴通讯股份有限公司 | Current-limiting protection method and device of resonance circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5796216A (en) * | 1993-07-16 | 1998-08-18 | Delta Power Supply, Inc. | Electronic ignition enhancing circuit having both fundamental and harmonic resonant circuits as well as a DC offset |
| KR960010713B1 (en) * | 1993-08-17 | 1996-08-07 | 삼성전자 주식회사 | Electronic ballast |
| US5767744A (en) * | 1995-11-22 | 1998-06-16 | Qsc Audio Products, Inc. | Lightweight fixed frequency discontinuous resonant power supply for audio amplifiers |
| DE19940137A1 (en) * | 1999-08-24 | 2001-03-01 | Philips Corp Intellectual Pty | Series-resonant converter with a control circuit |
-
2013
- 2013-12-18 US US14/133,044 patent/US9203318B2/en active Active
-
2014
- 2014-12-12 CN CN201410769355.7A patent/CN104734514B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8027174B2 (en) * | 2008-07-25 | 2011-09-27 | Samsung Electro-Mechanics Co., Ltd. | Adapter power supply |
| CN102130592A (en) * | 2009-12-28 | 2011-07-20 | 意法半导体股份有限公司 | Integrated circuit for an oscillator adapted to drive a control device of a switching resonant converter |
| CN102163919A (en) * | 2009-12-28 | 2011-08-24 | 意法半导体股份有限公司 | Charge-mode control device for a resonant converter |
| CN102684464A (en) * | 2011-03-15 | 2012-09-19 | 雅达电子国际有限公司 | Resonant converter device and use method therefor |
| CN103138590A (en) * | 2011-12-02 | 2013-06-05 | 中兴通讯股份有限公司 | Current-limiting protection method and device of resonance circuit |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107735946B (en) * | 2015-06-30 | 2021-11-19 | 通快许廷格两合公司 | High frequency amplifier device |
| CN107735946A (en) * | 2015-06-30 | 2018-02-23 | 通快许廷格两合公司 | High-frequency amplifier equipment |
| CN109560706A (en) * | 2017-09-27 | 2019-04-02 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN109560706B (en) * | 2017-09-27 | 2020-08-25 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN107659160A (en) * | 2017-11-10 | 2018-02-02 | 深圳市垅运照明电器有限公司 | A kind of DC DC constant-current circuits |
| CN107659160B (en) * | 2017-11-10 | 2019-11-12 | 深圳市垅运照明电器有限公司 | A kind of DC-DC constant-current circuit |
| CN111585443A (en) * | 2019-02-19 | 2020-08-25 | 布鲁萨电子公司 | DC-DC converter |
| CN111585443B (en) * | 2019-02-19 | 2023-12-22 | 布鲁萨海能公司 | DC-DC converter |
| CN110112928A (en) * | 2019-05-23 | 2019-08-09 | 北京闿明创新科技有限公司 | A kind of electric energy transfer device |
| CN110112928B (en) * | 2019-05-23 | 2020-12-18 | 北京闿明创新科技有限公司 | Electric energy transmission equipment |
| CN114128121A (en) * | 2021-04-12 | 2022-03-01 | 英诺赛科(苏州)科技有限公司 | Power converter with lossless current sensing capability and implementation thereof |
| CN114128121B (en) * | 2021-04-12 | 2023-03-10 | 英诺赛科(苏州)科技有限公司 | Power converter with lossless current sensing capability and implementation thereof |
| US11831243B2 (en) | 2021-04-12 | 2023-11-28 | Innoscience (Suzhou) Technology Co., Ltd. | Power converter with lossless current sensing capability and method for implementing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104734514B (en) | 2019-08-23 |
| US20150171754A1 (en) | 2015-06-18 |
| US9203318B2 (en) | 2015-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104734514A (en) | Primary side current regulation on llc converters for led driving | |
| CN104079175B (en) | New electric energy manages integrated circuit configuration | |
| US8891255B2 (en) | Switching power supply apparatus including simultanous control of multiple outputs | |
| JP4149915B2 (en) | Inductor current sensing and related methods in an isolated switching regulator | |
| US9860947B2 (en) | Driver circuit for illuminants, particularly LEDs | |
| US20140268911A1 (en) | Power management integrated circuit partitioning with dedicated primary side control winding | |
| US8400789B2 (en) | Power supply with input filter-controlled switch clamp circuit | |
| CN101622777B (en) | Load current detection in electrical power converters | |
| CN104052290B (en) | Switching Power Converter With Secondary To Primary Messaging | |
| CN102239629A (en) | Primary-side based control of secondary-side current for a transformer | |
| CN103795256A (en) | Switching power-supply device | |
| RU2698301C2 (en) | Controlled driver and excitation method | |
| US20120176818A1 (en) | Feedback of output voltage error via current sense winding | |
| US8670248B2 (en) | Primary-side controlled power converter with an RC network and method thereof | |
| TW201815047A (en) | Flyback converter and controlling method thereof | |
| US9397575B2 (en) | Switching power supply device | |
| US10020746B2 (en) | DC-DC converter with overvoltage protection | |
| CN109196767B (en) | Power control circuit | |
| CN113014112B (en) | Control circuit, control method and power converter | |
| JP2014150690A (en) | Current resonance type switching power source | |
| US7352106B2 (en) | Piezoelectric transformer driving apparatus | |
| TWI575856B (en) | Power supply module | |
| CN106533180A (en) | Power supply device | |
| JP5490443B2 (en) | Switching power supply | |
| CN111564837A (en) | Power supply device supporting power over Ethernet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210226 Address after: American Texas Patentee after: TEXAS INSTRUMENTS Inc. Address before: Fleisching, Germany Patentee before: TEXAS INSTRUMENTS Inc. |